NHK has learned that more than 12,000 homes were flooded due to Typhon Hagibis which swept across Japan over the weekend.
Data collected from NHK stations across the country showed that about 900 houses were destroyed or partially damaged.
Water rose above the ground floor in 7,907 homes in 16 prefectures, including Nagano and Tochigi.
Water entered below the ground floor in 4,296 houses in 21 prefectures, such as Shizuoka and Saitama.
A total of 66 homes in seven prefectures including Chiba were half-destroyed while 914 homes in 20 prefectures, including Tokyo and Kanagawa, were partially damaged.